N.H. Rev. Stat. Ann. § 259:68-a

"Number plate scanning device" or "LPR" means a license plate reading device that is mounted to a vehicle, that is attended to and operated by a law enforcement officer, and that uses automated high speed camera and optical character recognition technology to passively read, instantaneously identify against a list or lists, check, send an audible or visual alarm to the operator, and store for a prescribed period of time, a record of each number plate read.